Annotation of sys/arch/i386/stand/libsa/biosprobe.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: biosprobe.c,v 1.4 2004/03/09 19:12:12 tom Exp $ */
2:
3: /*
4: * Copyright (c) 2002 Tobias Weingartner
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/param.h>
29: #include <machine/biosvar.h>
30: #include <machine/pio.h>
31: #include <dev/cons.h>
32: #include <sys/disklabel.h>
33: #include "disk.h"
34: #include "debug.h"
35: #include "libsa.h"
36: #include "biosdev.h"
37:
38:
39: void *
40: getSYSCONFaddr(void)
41: {
42: u_int32_t status;
43: u_int8_t *vers;
44:
45: __asm __volatile(DOINT(0x15) "\n\t"
46: "setc %%al\n\t"
47: : "=a" (status)
48: : "0" (0xC000)
49: : "%ebx", "%ecx", "%edx", "%esi", "%edi", "cc");
50:
51: /* On failure we go for a NULL */
52: if (status)
53: return NULL;
54:
55: /* Calculate where the version bytes are */
56: vers = (void*)((BIOS_regs.biosr_es << 4) | BIOS_regs.biosr_bx);
57: return vers;
58: }
59:
60: void *
61: getEBDAaddr(void)
62: {
63: u_int32_t status;
64: u_int8_t *info;
65:
66: info = getSYSCONFaddr();
67:
68: if (!info)
69: return NULL;
70:
71: __asm __volatile(DOINT(0x15) "\n\t"
72: "setc %%al"
73: : "=a" (status)
74: : "0" (0xC100)
75: : "%ebx", "%ecx", "%edx", "%esi", "%edi", "cc");
76:
77: if (status)
78: return NULL;
79:
80: info = (void *)(BIOS_regs.biosr_es << 4);
81:
82: return info;
83: }
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